These aren't the cores you're looking for...
Intel's i9 is a solution in search of a problem. As a gamer who builds his own boxes, unfortunately, I don't even remotely see how i9 helps gamers.
There are basically two big bottlenecks to gamers today: PCIe lanes (aka more graphics cards and m.2 SSDs please!) and memory bandwidth.
Throwing more cores at the problem is, at best, just making things worse. It lowers the top-end GHz. (To date that still matters a lot. It's why we OC. Duh!) Gamers need the opposite of the i9: less cores on a larger die with a better thermal interface and lower voltages so that they can push the need for speed with a chip that OCs well.
If Intel really wants to help gamers, they need to ditch the more cores = better concept and get back to basics: Faster is better, bandwidth is your bottleneck, and cooling is king. It's a recipe as easy as π.